CN220646755U - Steam static pressure type sealing device - Google Patents
Steam static pressure type sealing device Download PDFInfo
- Publication number
- CN220646755U CN220646755U CN202320391766.1U CN202320391766U CN220646755U CN 220646755 U CN220646755 U CN 220646755U CN 202320391766 U CN202320391766 U CN 202320391766U CN 220646755 U CN220646755 U CN 220646755U
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- ring
- static
- steam
- sealing device
- static pressure
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- 238000007789 sealing Methods 0.000 title claims abstract description 88
- 230000003068 static effect Effects 0.000 title claims abstract description 85
- 239000011148 porous material Substances 0.000 claims description 9
- 238000007667 floating Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000007788 liquid Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The utility model discloses a steam static pressure type sealing device which is composed of a dynamic sealing component and a static sealing component, wherein a through hole communicated with the side wall surface of a static ring is formed on the end surface attached to a dynamic ring on the static ring, so that a sealing gas channel communicated with the outside is formed.
Description
Technical Field
The utility model relates to the technical field of mechanical sealing, in particular to a steam static pressure type sealing device.
Background
The steam seal is suitable for sealing the process medium which is steam, is mainly applied to occasions such as steam turbines, steam turbine power generation and the like, is a key part of the equipment, has great influence on the efficiency of the equipment, and according to statistics of some data, the leakage loss of the steam turbine accounts for about 1/3 of the internal loss of the steam turbine.
The existing common steam seals mainly comprise carbon ring seals, laganmao seals, honeycomb steam seals and the like, and the steam seals are gap seals, so that the leakage quantity is large, and the working efficiency of the steam turbine is directly reduced. At the same time, since much of the leaked steam, if large amounts of high temperature steam enter the bearings, damage will occur to the bearings, whereby these seals are typically equipped with specialized extraction and condensation equipment to recover the leaked steam, which in turn increases new equipment costs and maintenance costs.
The main difficulties of steam sealing are mainly that steam is easy to liquefy at high temperature to form a gas-liquid mixed phase state, and the traditional mechanical sealing with low leakage rate, dry gas sealing and the like are applied to steam, so that great technical difficulty exists.
Based on this, there is a need for an improvement in existing steam seals that increases the operating efficiency of the equipment and reduces the cost of the equipment by reducing the amount of steam leakage.
Disclosure of Invention
The utility model aims to provide a steam static pressure type sealing device which is composed of a dynamic sealing component and a static sealing component, wherein a through hole communicated with the side wall surface of a static ring is formed on the end surface attached to the dynamic ring on the static ring, a sealing gas channel communicated with the outside is formed, an orifice plate is arranged in the channel to control the leakage amount of water vapor, and the leakage of the water vapor is greatly reduced on the premise of ensuring that the water vapor is not condensed into water.
In order to achieve the technical purpose, the utility model is realized by the following technical scheme:
a steam static pressure type sealing device axially sleeved on a turbine shaft, comprising:
the dynamic seal assembly comprises a moving ring, wherein the moving ring is arranged at the shaft neck of the turbine shaft and synchronously rotates along with the turbine shaft;
the static seal assembly comprises a static ring and a pore plate;
the static ring is attached to the end face, far away from the shaft neck, of the movable ring, a through hole communicated with the side wall face of the static ring is formed in the end face, attached to the movable ring, of the static ring, two ends of the pore plate are communicated with each other and are arranged at the through hole of the side wall face of the static ring to form a sealing air channel communicated with the outside.
In this scheme, through set up the L type cross-section through-hole of the quiet ring lateral wall face of intercommunication at the terminal surface of quiet ring and rotating ring laminating, form the sealed gas passageway with external intercommunication, when this sealing device during operation, let into sealed gas through sealed gas passageway to the laminating face of quiet ring and rotating ring and make sound ring laminating face open, make the device in-process contactless wearing and tearing, also guarantee to seal and can both non-contact operation under different rotational speeds, and still set up the leakage volume of orifice plate control vapor in this passageway, under the prerequisite of guaranteeing that vapor does not condense into water, reduce the leakage of vapor by a wide margin.
As a further technical scheme of the steam static pressure type sealing device, in order to further improve the sealing effect of a dynamic ring and a static ring, a plurality of groups of through holes which are communicated with the end face and the outer circle are formed in the end face, attached to the dynamic ring, of the static ring, the pore plates are arranged in the through holes in the outer circle of the static ring, and the purpose of controlling the sealing leakage is achieved by controlling the size and the quantity of the pore plates.
As a further technical scheme of the steam static pressure type sealing device, in order to balance and stabilize the flow of sealing gas, the stability of a gas film between a movable ring and a static ring is ensured, a through hole penetrating through the pore plate is a horn-shaped air hole, the large end of the horn-shaped air hole faces to the outer circle through hole of the static ring, and the small end of the horn-shaped air hole faces to the inlet of the sealing gas channel.
As a further technical scheme of steam static pressure type sealing device, for making this device dismantle easy maintenance, improve its practicality, the dynamic seal subassembly still includes the axle sleeve, the axle sleeve set up in turbine shaft axle journal department, still be provided with on the axle sleeve with moving ring complex recess, keep away from on the axle sleeve the one end of recess is connected with compresses tightly the cover, compress tightly the outside end of cover and carry on the back tightly by the lock nut with turbine shaft threaded connection.
As a further technical scheme of the steam static pressure type sealing device, a movable ring supporting tension spring is sleeved on the shaft sleeve, a first cylindrical pin for transmitting torque is arranged between the steam turbine shaft and the shaft sleeve, and the movable ring supporting tension spring is in contact with the inner annular surface of the movable ring.
In this scheme, because the turbine shaft is rotating at a high speed, the phenomena of thermal expansion, jumping, shaping deformation and the like will inevitably occur at the journal portion, and in order to form a stable air film seal between the moving ring and the stationary ring, a strict parallel relationship is required between the sealing surfaces of the moving ring and the stationary ring. Therefore, in the moving ring and the static ring, at least one part is guaranteed to have self-adjusting capability, so the moving ring supporting tension spring is sleeved on the shaft sleeve and is contacted with the inner ring surface of the moving ring, the moving ring has a certain floating amount, and in order to prevent relative rotation between the turbine shaft and the shaft sleeve, a first cylindrical pin for transmitting torque is also arranged between the turbine shaft and the shaft sleeve.
As a further technical scheme of the steam static pressure type sealing device, in order to flexibly adjust the relative positions of the movable ring and the static ring and achieve a good sealing effect, at least one adjusting gasket is arranged at the joint end face of the shaft neck of the turbine shaft and the shaft sleeve.
As a further technical scheme of the steam static pressure type sealing device, the static sealing assembly further comprises a spring seat sleeved on the shaft of the steam turbine, a step cavity matched with the static ring is formed in the spring seat, a spring used for providing floating force is connected between the spring seat and the static ring, and the static ring is guaranteed to be always attached to the movable ring.
As a further technical scheme of the steam static pressure type sealing device, a second cylindrical pin is arranged between the spring seat and the turbine cavity, and a third cylindrical pin is arranged between the spring seat and the stationary ring, so that the stationary ring, the spring seat and the turbine cavity can be prevented from rotating relatively.
As a further technical scheme of the steam static pressure type sealing device, a pressing plate used for limiting the displacement of the static ring is arranged on the end face of one side, close to the static ring, of the spring seat.
As a further technical scheme of the steam static pressure type sealing device, a bidirectional dynamic pressure groove is formed in the sealing joint end face of the movable ring.
In the scheme, as the superheated steam can be liquefied when the temperature is reduced, the sealing gas can be in a gas-liquid mixed state when the machine is started or in an abnormal state, and at the moment, the liquid water can influence the opening of the sealing end face, so that the sealing is worn. Therefore, the two-way dynamic pressure grooves are designed on the sealing end face of the movable ring, so that when the sealing steam contains liquid water, the two-way dynamic pressure grooves can rapidly discharge the liquid water while improving the stability of the air film.
According to the steam static pressure type sealing device, the dynamic sealing assembly and the static sealing assembly are combined together, through the through holes communicated with the side wall surface of the static ring are formed in the end face attached to the dynamic ring on the static ring, and the sealing gas channel communicated with the outside is formed.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this application, illustrate embodiments of the utility model. In the drawings:
FIG. 1 is a schematic structural view of a steam static pressure type sealing device provided by the utility model;
FIG. 2 is a schematic view of a partial enlarged structure of a mark A in FIG. 1;
FIG. 3 is a schematic diagram of the dynamic pressure groove end face structure of the dynamic ring;
fig. 4 is a partially enlarged schematic structural view of a symbol B in fig. 1.
In the drawings, the reference numerals and corresponding part names:
the novel O-shaped sealing ring comprises a 1-shaft sleeve, a 2-first O-shaped sealing ring, a 3-second O-shaped sealing ring, a 4-movable ring supporting tension spring, a 5-adjusting gasket, a 6-first cylindrical pin, a 7-hole plate, an 8-spring, a 9-locking nut, a 10-second cylindrical pin, an 11-first cylindrical head screw, a 12-retainer ring, a 13-spring seat, a 14-third cylindrical pin, a 15-pressing sleeve, a 16-second cylindrical head screw, a 17-stationary ring, a 18-movable ring, a 19-third O-shaped sealing ring, a 20-third cylindrical head screw, a 21-pressing plate, a 22-fourth O-shaped sealing ring, a 23-fifth O-shaped sealing ring, a 24-sixth O-shaped sealing ring, a 25-seventh O-shaped sealing ring and a 26-eighth O-shaped sealing ring.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present utility model, the present utility model will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present utility model and the descriptions thereof are for illustrating the present utility model only and are not to be construed as limiting the present utility model.
Example 1
The embodiment 1 provides a steam static pressure type sealing device, as shown in fig. 1-4, which is axially sleeved on a turbine shaft and is positioned in a cavity of the turbine, and is used for isolating a high-temperature medium side from an external atmosphere side, and comprises a dynamic sealing assembly and a static sealing assembly.
The dynamic seal assembly comprises a movable ring 18 and a shaft sleeve 1, wherein the shaft sleeve 1 is arranged at the shaft neck of the turbine shaft, a first O-shaped sealing ring 2 is arranged between the shaft sleeve 1 and the assembling surface of the turbine shaft for preventing media from leaking from a gap between the shaft sleeve 1 and the turbine shaft, a groove tightly matched with the movable ring 18 is formed in the shaft sleeve 1, a third O-shaped sealing ring 19 and a second O-shaped sealing ring 3 are further arranged at the bottom of the groove and on the side wall surface of the inner ring respectively for preventing media from leaking, a compression sleeve 15 is connected to one end, far away from the groove, of the shaft sleeve 1, a second cylindrical head screw 16 is used for fixing the compression sleeve 15 and the shaft sleeve 1 in the axial direction of the turbine shaft, the movable ring 18 is fixed on the shaft sleeve 1 and synchronously rotates along with the turbine shaft, and the outer side end of the compression sleeve 15 is backed up by a locking nut 9 in threaded connection with the turbine shaft.
The static seal assembly comprises a spring seat 13 sleeved on a turbine shaft, a static ring 17 and a pore plate 7, wherein a stepped cavity adapting to the static ring 17 is formed in the spring seat 13, the static ring 17 is in fit with the end face, far away from the bottom surface of the groove, of the movable ring 18, an L-shaped cross section through hole communicated with the side wall surface of the static ring is formed in the end face, close to the movable ring 18, of the static ring 17, a through hole corresponding to the through hole is formed in the spring seat 13, two ends of the pore plate 7 are communicated with each other and are arranged at the junction of the static ring 17 and the through hole of the spring seat 13 to form a seal gas channel communicated with the outside, the seal gas flows to be as shown in fig. 2 and 4, a fifth O-shaped sealing ring 23 and a sixth O-shaped sealing ring 24 are respectively arranged at two side ends of the pore plate 7, meanwhile, a spring 8 used for providing floating force is connected between the bottom of the stepped cavity and the static ring 17, the spring 8 can provide enough floating force for the static ring 17, the static ring 17 can be always in fit with the movable ring 18, and in order to avoid seal gas leakage, an eighth O-shaped sealing ring 26 is arranged between the inner ring surface of the static ring 17 and the side wall surface of the stepped cavity and the side wall surface of the static ring 13, and a seventh O-shaped sealing ring 25 is respectively arranged between the seventh O-shaped sealing ring 22 and the side wall of the turbine cavity and the seventh O-shaped sealing ring 25.
In this embodiment, in order to further improve the sealing effect of the static and dynamic ring 17, the end face of the static ring 17 attached to the dynamic ring 18 is provided with a plurality of groups of through holes with L-shaped cross sections, which are communicated with the end face and the outer circle, the through holes at the outer circle of the static ring 17 are all provided with the orifice plates 7, and the purpose of controlling the sealing leakage amount is achieved by controlling the size and the number of the orifice plates 7, and in order to make the sealing gas flow balanced and stable, the stability of the gas film between the dynamic ring 18 and the static ring 17 is ensured, the through holes penetrating through the orifice plates 7 are horn-shaped gas holes, the large ends of the horn-shaped gas holes face the through holes at the outer circle of the static ring 17, and the small ends of the horn-shaped gas holes face the inlet of the sealing gas channel.
In this embodiment, the sleeve 1 is further sleeved with a moving ring supporting tension spring 4, the moving ring supporting tension spring 4 contacts with the inner ring surface of the moving ring 18, so that the moving ring 18 has a certain floating amount, and in order to prevent relative rotation between the turbine shaft and the sleeve 1, a first cylindrical pin 6 for transmitting torque is further arranged between the turbine shaft and the sleeve 1.
In this embodiment, in order to flexibly adjust the relative positions of the movable ring 18 and the stationary ring 17 to achieve a good sealing effect, at least one adjusting gasket 5 is disposed at the joint end face of the shaft neck of the turbine shaft and the shaft sleeve 1, the adjusting gasket 5 is a plurality of gaskets with different thicknesses, and the actual position of the shaft sleeve 1 can be adjusted according to the actual measured dimension during assembly, so as to adjust the relative position of the movable ring 18.
In this embodiment, in order to prevent the stationary ring 17 and the spring seat 13 from rotating relative to the turbine cavity, a second cylindrical pin 10 is disposed between the spring seat 13 and the turbine cavity, and a third cylindrical pin 14 is disposed between the spring seat 13 and the stationary ring 17.
In this embodiment, the spring seat 13 is provided with a pressing plate 21 for limiting axial displacement of the static ring 17 and the corresponding O-ring 23 on one side end surface near the static ring 17, the pressing plate 21 is pressed and fixed on the spring seat 13 by a third cylindrical head screw 20, the other side end surface of the spring seat is provided with a retainer ring 12 (split type), the retainer ring 12 is fixed in a groove corresponding to the cavity of the steam turbine, and the retainer ring 12 and the spring seat 13 are connected and fixed together by the first cylindrical head screw.
In this embodiment, a bidirectional dynamic pressure groove is provided on the seal bonding end surface of the movable ring 18, as shown in fig. 3, so that the bidirectional dynamic pressure groove can rapidly discharge liquid water when the sealing gas contains liquid water while improving the stability of the gas film.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the utility model, and is not meant to limit the scope of the utility model, but to limit the utility model to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (10)
1. Steam static pressure formula sealing device, axial cover locate turbine shaft, its characterized in that includes:
the dynamic seal assembly comprises a moving ring (18), wherein the moving ring (18) is arranged at the shaft neck of the turbine shaft and synchronously rotates along with the turbine shaft;
the static seal assembly comprises a static ring (17) and an orifice plate (7);
the sealing device is characterized in that the stationary ring (17) is attached to the end face, far away from the shaft neck, of the movable ring (18), a through hole which is communicated with the side wall surface of the stationary ring (17) is formed in the end face, attached to the movable ring (18), of the stationary ring (17), two ends of the pore plate (7) are communicated, and a sealing air channel which is communicated with the outside is formed in the through hole of the side wall surface of the stationary ring (17).
2. The steam static pressure type sealing device according to claim 1, wherein a plurality of groups of through holes which are communicated with the end face and the outer circle are formed in the end face, attached to the movable ring (18), of the static ring (17), and the hole plates (7) are arranged in the through holes at the outer circle of the static ring (17).
3. A steam static pressure type sealing device according to claim 2, characterized in that the through hole in the orifice plate (7) is a horn-shaped air hole, the big end of the horn-shaped air hole faces to the excircle through hole of the static ring (17), and the small end of the horn-shaped air hole faces to the sealing air channel inlet.
4. A steam static pressure type sealing device according to claim 3, wherein the dynamic sealing assembly further comprises a shaft sleeve (1), the shaft sleeve (1) is arranged at the shaft neck of the turbine shaft, a groove matched with the movable ring (18) is further formed in the shaft sleeve (1), one end, away from the groove, of the shaft sleeve (1) is connected with a compression sleeve (15), and the outer side end of the compression sleeve (15) is backed up by a locking nut (9) in threaded connection with the turbine shaft.
5. The steam static pressure type sealing device according to claim 4, wherein a movable ring supporting tension spring (4) is sleeved on the shaft sleeve (1), a first cylindrical pin (6) for transmitting torque is arranged between the steam turbine shaft and the shaft sleeve (1), and the movable ring supporting tension spring (4) is in contact with the inner annular surface of the movable ring (18).
6. A steam static pressure sealing arrangement according to claim 5, characterized in that at least one adjusting shim (5) is provided at the joint end face of the turbine shaft journal and the shaft sleeve (1).
7. The steam static pressure type sealing device according to claim 6, wherein the static seal assembly further comprises a spring seat (13) sleeved on a turbine shaft, a stepped cavity matched with the static ring (17) is formed in the spring seat (13), and a spring (8) used for providing floating force is connected between the spring seat (13) and the static ring (17).
8. The steam static pressure type sealing device according to claim 7, wherein a second cylindrical pin (10) is arranged between the spring seat (13) and the turbine cavity, and a third cylindrical pin (14) is arranged between the spring seat (13) and the static ring (17).
9. A steam static pressure type sealing device according to claim 8, characterized in that a pressing plate (21) for restricting the displacement of the stationary ring (17) is provided on one side end surface of the spring seat (13) close to the stationary ring (17).
10. A steam static pressure type sealing device according to any one of claims 1-9, characterized in that the sealing abutment end face of the moving ring (18) is provided with bi-directional dynamic pressure grooves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320391766.1U CN220646755U (en) | 2023-03-06 | 2023-03-06 | Steam static pressure type sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320391766.1U CN220646755U (en) | 2023-03-06 | 2023-03-06 | Steam static pressure type sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220646755U true CN220646755U (en) | 2024-03-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320391766.1U Active CN220646755U (en) | 2023-03-06 | 2023-03-06 | Steam static pressure type sealing device |
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| Country | Link |
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| CN (1) | CN220646755U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118362497A (en) * | 2024-06-19 | 2024-07-19 | 合肥通用机械研究院有限公司 | Double-support type mechanical seal test device and mechanical seal performance test method |
-
2023
- 2023-03-06 CN CN202320391766.1U patent/CN220646755U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118362497A (en) * | 2024-06-19 | 2024-07-19 | 合肥通用机械研究院有限公司 | Double-support type mechanical seal test device and mechanical seal performance test method |
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